Joint cement compositions containing mica and quaternary compounds

ABSTRACT

asbestos-free joint cement compositions are disclosed comprised of a binder, mica, calcium carbonate, a thickener, and a specified quaternary ammonium compound. 
     It has been conventional to replace asbestos with attapulgite clay to provide the body and anti-sagging properties usually associated with asbestos. Attapulgite, however, must be employed at levels which give rise to a severe cracking problem. The interaction of the quaternary compound with the mica gives the formulations sufficient body that the attapulgite and its attendant cracking problem can be substantially eliminated.



